Y. Kurniawan, H. Md. Som, N. M. Nik Abd. Rahman, O. Inayatullah, N. A. Yusuff, and N. Y. Musa, “Kesan Energi Selawat Nabi Berdasarkan Perubahan Warna Aura: The Energy Effects of Salutation upon Prophet Muhammad Based on the Change of Colour Aura”, PERS, vol. 8, no. 2, pp. 109–121, Nov. 2016.